Laminated material



LAMINATED MATERIAL Filed Dec. 10, 1930 Z m lllllsmmw 1 ml! ll 1191117 1 \Z Z kw/ W ATTORN E'Y coated sheets or films of 'where rigidity and improved Patented Dec. 11, 1934 UNITED STATES PATENT ()FFICE 1,983,875 LAMINATED MATERIAL N. Y., a corporation of Delaware Application December 10,

1930, Serial No. 501,18

20 Claims. (01. 154-40 This invention relates to a laminated material and more particularly to a laminated material which contains at least one ply or lamination of a moistureproof sheet or film of regenerated cellulose.

Recently, there has appeared on the market a new material which consists of moistureproof sheets or films of regenerated cellulose. By the term moistureproof is meant the ability to resist the diffusion of water vapor to an extent at least as great as that displayed by waxed papers employed as wrappers and functioning to resist the penetration of water vapor therethrough to a substantial degree for asubstantial period of time, depending on the article wrapped and/or being approximately 7 times or more, and preferably 20 to 30 times, as effective as unregenerated cellulose when tested in accordance with the test set forth in the Journal of Industrial and Engineering Chemistry on page 575, vol. 21, No. 6 (June 1929). In one of its modifications, this material consists of a sheet or film of regenerated cellulose combined with, as by being coated on both sides, a moistureproofing composition comprising, for example, a cellulose derivative and a wax with or without a plasticizer and preferably also a gum or resin. These coated sheets or films of regenerated cellulose, in addition to being moistureproof, are also flexible, non-tacky,

tough and preferably also transparent. By virture of these characteristics they areparticularly suitable for packaging of goods which are desired to be exhibited to view and which are desired to be retained in their original state. They, therefore, have been used extensively for wrapping foodstuffs, such as cakes, cookies, fruits, etc. and other products, such as cigars and tobacco, as well as other goods where the value of the product is dependent on the preservation of the amount of moisture which the goods originally contained at the time of wrapping.

There are, however, where the transparency and flexibility are not strictly required and, indeed, there are cases strength are defi nitely desired. I have found that by laminating a moistureproof material such as a moistureproof sheet or film of regenerated cellulose to itself, paper, cardboard, paperboard, boxboard, fabrics, metal foil, corkboard and the like, I can obtain a product which is capable of being used where moisa number of purposes being decidedly rigid.

tureproof sheets or films of regenerated cellulose per se are not suitable.

It is therefore an object of this invention to provide a laminated material having at least one ply thereof consisting of a moistureproof 5 material such as a moistureproof sheet or film of regenerated cellulose.

Another object of this invention is to provide a material which comprises a laminated material wherein at least one ply thereof consists of a 1 moistureproof material such as a moistureproof sheet or film of regenerated cellulose secured to itself, paper, cardboard, paperboard, boxboard, fabric, metal foil, corkboard and the like.

Other objects will appear from the following description, appended claims and accompanying drawing in which:

Figures 1 to 4 illustrate exaggerated crosssections of various forms of materials constituting this invention. 20

In accordance with the principles of. this invention, a moistureproof material, for example a moistureproof sheet or film or regenerated cellulose 1 is laminated or combined with various other materials 2, such as itself, cardboard, paperboard, boxboard, fabric, metal foil, corkboard, etc. To practice this invention it is necessary to use an adhesive which will satisfactorily produce adhesion between the various laminae. I have found, for example, that an adhesive having the characteristics possessed by the example hereafter set forth will produce satisfactory results, although it is clear that the variations of this and even other adhesives may be developed which may also be suitable for this purpose. 3

Example I Part by weight Pontianiac chips -c 1.0 Castor Oil 0. 6 Ethylalcohol 1.0

The adhesive may be applied to either one or both of the materials and then the materials may be superposed on one another. Sufiicient pressure with or without heat is then applied and maintained'until satisfactory adhesion between the materials has been effected.

When moistureproof sheets of regenerated cellulose 1 are laminated as described, the flexibility of the product will, of course, depend on the flexibility of the material which is used in the combination. It is apparent that the product may vary from being relatively flexible to with an open mesh fabric produce a material which is transparent without sacrificing strength, durability, rigidity and flexibility.

The lamina or plies ofthe final laminated product are of substantially the same length Width. In other words, the plies or laminea of the laminated product are substantially coextensive. As a consequence, the laminated stantially stronger than the tureprooi film per se.

4 (see Figure 2) modifications of two moistureproof material. such as a moistureproof sheet or film of regenerated cellulose 1 and 2. ply or any suitable material 2, as illustrated in Figure 1. It may consist of a mole tureproof material, for example a moistureproof sheet or film of regenerated cellulose 1 disposed between two sheets 2 of similar or non-similar materials as shown in Figure 3. As illustrated s, the product may also consist of a ply, of the previously mentioned materials disposed between two moistureprooi sheets of regenerated cellulose.

in order to enhance the attractiveness appearance oi? the product, the base material may be suitably ornamented. as by printing, embossing or otherwise decorating and/or using the colored otherwise decorated sheets or regenerated cellulose. 4

The product which constitutes invention may be made in various sizes and may be used as such or fabricated into boxes, bags con-- tainers in general and of other materials for .3. laminated material conipr tureproof sheet or of regen l cellular. secured by a water-insoluble adhesive to the laminae being substantially coextensive.

4.. A laminated material comprising" a znois tureproof. sheet or film of regenerated cellulose secured by a water-insoluble adhesive to a fabric, the lamina being substantially coextensive.

5. A. laminated material comprising amoio extensive. 1

ii. A laminated material comprising'a moistureproof sheet or Elna of regenerated cellulose secured by a water-insoluble adhesive to a metal i'oil, the laminae being substantially coextensive. "I. A laminated material having at .least one was: secured by a waterdnsoluble adhesive to the adjacent lamina, the lamina being substantially coextensive.

a moistureproofing composition comprising a cellulose derivative and a was secured by a waterinsoluble adhesive to the adjacent lamina, th laminae being substantially coextensive.

10. A iamuiated material having at least one lamina consisting of a sheet or film of regenerated cellulose coated on both sides thereof with a inoistureprooflng composition comprising a cellulose derivative, a resin and a wax secured by a watei insoluble adhesive the laminae being substantially coextensive.

11. A laminated material having at least one lamina consisting of a-sheet or film coated on both sides thereof with a moistureproofing com- ;oosition containing a wax secured by a water- :lnseluble adhesive to the adjacent lamina, the lamina being substantially coextensive.

laminated material having at least one lamina consisting of a sheet or film of regenerated cellulose coated on both sides thereof with a moistweproci'ing composition containing a wax seeureo'; by a waterdnsoluble adhesive to the adiacent laminae, the laminae being substantially co extensive.

is o film l=&llefil0lllll038 coated on both des eof with moistureprooilng composi=- containing a was: and secured by a Wateroluble adhesive to fibrous material, thalamsubstantially coextensive.

' laminated material comprising a sheet or cellulose coated on both sides with a inois'tureproofing composition ing a wax: and secured by a water-insolpaper, the lamina: being sub material comprising a sheet or eellui se coated. on both sides coring" corngiesition conia'hric, the laminae being substan is. ll 3. .ed material comprising a sheet or film of regenerated cellulose coated on both sides thereof with a moisturenroofing composition containing wax secured by a Water-insoluble adhesive to an open mesh fabric, the laminae be substantially coextensive.

17. A la'ninatecl material comprising a sheet or film or regenerated cellulose ninated material comprising a sheet i secured by a water -insoluble coated on both sides 4 lamina consisting 01 a moistureproof sheet or.

film of regenerated cellulose secured by a waterinsoluble adhesive' to the adjacent lamina, the laminae-being substantially. coextensive and the adhesivecomprising gum pontianiac and castor oil. I 1

l 19. A laminated material having at least one lamina consisting of a sheet or film of regenerated celiulosecoated on both sides thereof with a moisturepi-oofing composition comprising a cellulose derivative and a wax secured by a waterinsoluble adhesive to the adjacent lamina, the

lamina being substantially coextensive and the adhesive comprising gum pontianiac and castor 2o. Alaminated material comprising a sheetor film of regenerated cellulose coated on both sides with a moistureproofing composition containing a wax and. secured by a water-insoluble adhesive to the adjacent lamina, the laminae being substantially coextensive and the adhesive comprising gum pontianiac and castor oil.

KARL EDWIN PRINDLE. 

